Gas burner



Nov. 1i, 1924. 1,515,172

T. A. RONSTROM GAS BURNER v Filed OCT.. 18, 1920 E'QTZ Patented New. il, 1924.

. THOMAS a RoNsTR-OM', or cmcAGo, ILLInoIs.

Acms BURNER.

Application aleaoctbber 1'8, 1920, serial No. 417,538.

` To all/whom #may concern.'

Be it known that I, THQMASVA. RON- s'rRoiir, a subject of the King ofSweden,

having made 'application for Acitizenship struction shown and described as indicated in the claims. In the drawings:

Figure 1 is an axial section of a burner embodying this invention, the same being 'shown mounted in and protruding through the nbase of a heating chamber, such, for example, as might be employed fora water heater having water circulation tubes, not

shown in the drawings.

,y i Figure 2 is a detail side elevation looking in the direction of the arrow, 2, on Figure 1. Figure 3 is a section lat the line,`3-3, on

Figure 1.

@In the structure shown in the drawings,

1 is a primary air inlet pipe for; the burner.

. 2 is a pipe which is co-axial with the pipe, 1, encompassing the same andv annularly-spaced therefrom and mounted thereon by means of il bushing, 3, interiorly threaded for screwing the primary air pipe, 1, through it,

whereby said primary air pipe is rendered axially adjustable for-purposes which will hereafter appear.l The pipe, 2, atitslower part which encompasses the upper part'of the primary air pipe, 1, constitutes the discharge portion of the gas inlet pipe whose initial portion is a pipe, 4, screwed into the side of the pipe, 2, for opening into the annular space between saidpipe, 2, andf'the pipe, 4. Said pipe, 2, is interiorly tapered at its upper part 2a, surrounding the discharge end portion of the primary air inlet pipe, the taper preferably continuing beyond the discharge end ofthe said primary inlet pipe and reducing the interior-diameter of said inlet pipe to less than the interior diameter of the air pipe,A 1. Preferably the discharge end of the pipe, Al, is exteriorly'ltapered at 1a, so that it may be madeto seat on the interiorly tapered wall of the pipe, 2, the threaded portion 1b, of the pipe, 1, Where it is screwed'through the bushing, 3, being sufciently extended to permit said pipe, 1, to be thus adjusted to seating on the interiorly tapered of the pipe, 2. Thefgas is intended to besupplied under pressure, and the aboveconstruction, it will be seen, results in the dischargeof' an annular jet of gas `around the tapered discharge end ll'of the primary air inlet pipe, 1, whereby there will be produced an entrai'nment/or drawing in 0fthe air through said air ,inlet pipel by the annular gas jet delivered undei` pressure. The pipe, 2, extends beyond the discharge end of the pipe, 1, for a considerable distance, and the extended portion marked with .reference numeral 5 at its upper end constitutes Va mixing chamber in which the gas delivered under pressure andtheair entrained and drawn in through the primary air supplypipe, 1, will be thoroughly mixed,

j such mixture being promoted bylzthe slightly oblique direction of discharge of the gas following the interior taper of thepipe, 2, at the portion which joins the extended discharge end, 5, of the air inlet pipe. `Avsec. ondary air supply pipe, 6, encompassesjand is annularly. spaced from said extension, 5, of thepipe, 2, by reason of the relativelyx thick wall of the upper end of said pipe32,' with which the pipe, 6, is telescopicallyfenga'ged; and said pipe, 6,. extends upwardly beyond the upper discharge end of the primary mixing chamber, 2", and -at its upper edge is preferably capped with a fine net wire screen, 7. vNear its lower end the pipe, 6, has .air inlet apertures, 6a, and thereby said pipe constitutes 'a secondary -air supply pipe,

' the' air which enters throughfffsaid apertures, 6, being discharged annularly around the mixture which is discharged from the upper -end of the primary mixing chamber, 2"., the

portion of said pipe, 6, which extends above vtheupper end of said primary mixing chamber constituting a secondary mixing chamber in which the additional supply of air is intermixed, the mixturebeing rendered more complete by its'discharge through the iine -4 pipe, 6, and secured thereto by means of'an Aannular bushing, 10, at its lower end aboveA which bushing the pipe, 9, has a series of apertures, 9", substantially opposite the apertures, 6, of the pipe, 6, and preferably of greater number than the apertures, 6, While the remainder are radiallyopposite the intervals between them. l Y

, By this arrangement of the' apertures it will be seen that air is supplied toV the pipe,

. 6,t through the apertures, 9, whichv are aligned, with the apertures, 6, and that additional air may'enter through the remainder of the apertures, 9, for supplying air which will be delivered upwardly through said pipe, 9, for discharge at 6b around the upper end of the secondary mixing chamber which is formed by the upper portion of the pipe, 6, as above set forth. Atthe upper i end of the pipe, 9, terminating a short dis-' tance above the screen 7, `which' caps the supply pipe, said pipe, 9, has an in-turned ilange, 9b', forming a projecting lip for directing the air current which risesI through'v the pipe, 9, inward radially into and across the mixture which is discharged through the wire screen,'7, for supportuig combustion, it being the intended mode of operation of `the structure, that the mixture discharged through the screen shall be ignited at this point, and the intended proportions and adjustment of the parts being such that the air,

which may be supplied through said outer pipe, 9, completes the supply necessary for perfect combustion at the point of ignition.

lin addition to the adjustment of the primary and air inlets for regulating the annular aperture through which-the gas is discharged, and thereby regulating the amount of gas admitted ror mixture with the pri# mary air supply, the apertures, 6a and 9,

in thepipes, 6 and 9, respectively, are provided with meansfor regulation .consisting of encompassing rings, 11 and 12, respectively,l having apertures corresponding to and adapted to register with the apertures,

intruded through an aperture in the base as shown in Figure 1, the heater as to its enclosing walls being seen at 15, and the base at 16, said casing having no other inlet or means of access of air for causing combustion or mixing with the products of com- 1 bustion,` except that which enters through the properly proportioned and adjusted apertures of the burner. it is in view of this manner of use that the burner is provided with the outer pipe, 9, and with the feature consisting of the 1n-turned'lip, 9b, ofv said .pipe, bywhich said iinal supply of air isl thoroughly -intermixed with the preceding `mixture for producing perfect combustion.

And for further .insuring this result and adapting the burner to use a maximum, I

quantity of gas and thereby vdevelop a maxi mum amount of heat Within given dimensions, the details of constructiom, particu- .larly including saidin-turnedlip, are such that upon ignition the said lip and through it by conduction the entirepipe, 9, becomes highly heated and in practice nearly to red heat, the pipe, 6, also becoming heated to a high temperature for a considerable distance including so much of its length as constitutes the secondary mixing chamber 2b, and this results -in a` strong natural draft, supplementing the draft which isproduced by entrainment, and increasing the air supply which is taken in through the primary alrfinlet, as well as through the secondary air `pipe, 6, and the outer pipe, 9. The result is that the burner being started with the primary air pipe adjusted so as to limit the gas to a very narrow annular rift, and its correspondingly limited quantity,.as the vburning proceeds and the burners become heated, the pipe 1, may be adjusted'to increase the gas supply because the draft resulting from the Aheating ofthe burner has largely increased the air supply; and further adjustment may be made up to a cer-l tain maximum point for which theburner is calculated .in its several dimensions.

. 1. A' gas burnercomprising in combination, a primary air supply pipecentrally positioned; a pipe for' supplying gas under pressure, having an annular discharge encompassing the discharge'erulgof the primary air supply pipe, whereby the primary air supply is entrained by the gas discharged under pressure, a mixing chamber beyond the discharge end of the .primary air-and gas supply passages; a secondary air pipe and an outer pipe having each restricted air inlets at their lower parts, the outer pipe extending down and being closed as to air access, below the air inlet of the secondary pipe, whereby the-,air supply for the secondary pipe is derived through the air inlets of the outer pipe, said outer pipe inlets being in excess of the air inlets of the secondary pipe.

- 2. A gas burner comprising in combination, a primary air supply pipe centrally positioned; a pipe Afor supplying gas under pressure, having an annular discharge en* compassing the discharge end of the primary air supply pipe, whereby the primary air supply is entrained by the gas discharged lill@ discharge end of the primary air and gas 'l supply passages; a secondary air pipe and anv outer pipe concentrically disposed 'about and beyond the discharge end of the 'pri mary air supply pipe, the outer pipe having at its discharge end beyond the discharge end of said secondary air pipe, with an' {in-turnedflange or lip for directing the air` dischar e of said outer p'ip'e inward acrossthe disc arge from the secondary, air pipe.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois, this l13th day of October, 1920.

lTHOMAS A.l RONSTROM. 

